7. A bag contains 64 marbles, all solid colored. Each marble is either red, yellow, or green. A marble is randomly removed from the bag and then returned to the bag. The probability that this marble is red is . The probability that this marble is yellow is . How many green marbles are in the bag ?

Answer and Explanation

Your Answer is

Correct Answer is E

Explanation

Through the corresponding probability, the number of red balls and yellow balls can be calculated as 30 and 16 respectively, so the number of remaining balls, that is, green balls, is 8. Choose E.